The Saint Piran's Flag reference article from the English Wikipedia on 24-Jul-2004
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Saint Piran's Flag

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Saint Piran's Flag is regarded as the "national" flag of Cornwall and an emblem of the Cornish people. The banner of Saint Piran is a vertical white cross on a black background. Saint Piran is supposed to have adopted these two colours from seeing the white tin in the black coals and ashes during his supposed discovery of tin.

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